1/* 2 * Copyright (C) 2007, 2008, 2009 Siemens AG 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 6 * as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License along 14 * with this program; if not, write to the Free Software Foundation, Inc., 15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 16 * 17 */ 18 19#include <linux/slab.h> 20#include <linux/kernel.h> 21#include <linux/module.h> 22#include <linux/device.h> 23 24#include <net/wpan-phy.h> 25 26#include "ieee802154.h" 27 28#define MASTER_SHOW_COMPLEX(name, format_string, args...) \ 29static ssize_t name ## _show(struct device *dev, \ 30 struct device_attribute *attr, char *buf) \ 31{ \ 32 struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev); \ 33 int ret; \ 34 \ 35 mutex_lock(&phy->pib_lock); \ 36 ret = snprintf(buf, PAGE_SIZE, format_string "\n", args); \ 37 mutex_unlock(&phy->pib_lock); \ 38 return ret; \ 39} \ 40static DEVICE_ATTR_RO(name); 41 42#define MASTER_SHOW(field, format_string) \ 43 MASTER_SHOW_COMPLEX(field, format_string, phy->field) 44 45MASTER_SHOW(current_channel, "%d"); 46MASTER_SHOW(current_page, "%d"); 47MASTER_SHOW(transmit_power, "%d +- 1 dB"); 48MASTER_SHOW(cca_mode, "%d"); 49 50static ssize_t channels_supported_show(struct device *dev, 51 struct device_attribute *attr, 52 char *buf) 53{ 54 struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev); 55 int ret; 56 int i, len = 0; 57 58 mutex_lock(&phy->pib_lock); 59 for (i = 0; i < 32; i++) { 60 ret = snprintf(buf + len, PAGE_SIZE - len, 61 "%#09x\n", phy->channels_supported[i]); 62 if (ret < 0) 63 break; 64 len += ret; 65 } 66 mutex_unlock(&phy->pib_lock); 67 return len; 68} 69static DEVICE_ATTR_RO(channels_supported); 70 71static struct attribute *pmib_attrs[] = { 72 &dev_attr_current_channel.attr, 73 &dev_attr_current_page.attr, 74 &dev_attr_channels_supported.attr, 75 &dev_attr_transmit_power.attr, 76 &dev_attr_cca_mode.attr, 77 NULL, 78}; 79ATTRIBUTE_GROUPS(pmib); 80 81static void wpan_phy_release(struct device *d) 82{ 83 struct wpan_phy *phy = container_of(d, struct wpan_phy, dev); 84 85 kfree(phy); 86} 87 88static struct class wpan_phy_class = { 89 .name = "ieee802154", 90 .dev_release = wpan_phy_release, 91 .dev_groups = pmib_groups, 92}; 93 94static DEFINE_MUTEX(wpan_phy_mutex); 95static int wpan_phy_idx; 96 97static int wpan_phy_match(struct device *dev, const void *data) 98{ 99 return !strcmp(dev_name(dev), (const char *)data); 100} 101 102struct wpan_phy *wpan_phy_find(const char *str) 103{ 104 struct device *dev; 105 106 if (WARN_ON(!str)) 107 return NULL; 108 109 dev = class_find_device(&wpan_phy_class, NULL, str, wpan_phy_match); 110 if (!dev) 111 return NULL; 112 113 return container_of(dev, struct wpan_phy, dev); 114} 115EXPORT_SYMBOL(wpan_phy_find); 116 117struct wpan_phy_iter_data { 118 int (*fn)(struct wpan_phy *phy, void *data); 119 void *data; 120}; 121 122static int wpan_phy_iter(struct device *dev, void *_data) 123{ 124 struct wpan_phy_iter_data *wpid = _data; 125 struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev); 126 127 return wpid->fn(phy, wpid->data); 128} 129 130int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data), 131 void *data) 132{ 133 struct wpan_phy_iter_data wpid = { 134 .fn = fn, 135 .data = data, 136 }; 137 138 return class_for_each_device(&wpan_phy_class, NULL, 139 &wpid, wpan_phy_iter); 140} 141EXPORT_SYMBOL(wpan_phy_for_each); 142 143static int wpan_phy_idx_valid(int idx) 144{ 145 return idx >= 0; 146} 147 148struct wpan_phy *wpan_phy_alloc(size_t priv_size) 149{ 150 struct wpan_phy *phy = kzalloc(sizeof(*phy) + priv_size, 151 GFP_KERNEL); 152 153 if (!phy) 154 goto out; 155 mutex_lock(&wpan_phy_mutex); 156 phy->idx = wpan_phy_idx++; 157 if (unlikely(!wpan_phy_idx_valid(phy->idx))) { 158 wpan_phy_idx--; 159 mutex_unlock(&wpan_phy_mutex); 160 kfree(phy); 161 goto out; 162 } 163 mutex_unlock(&wpan_phy_mutex); 164 165 mutex_init(&phy->pib_lock); 166 167 device_initialize(&phy->dev); 168 dev_set_name(&phy->dev, "wpan-phy%d", phy->idx); 169 170 phy->dev.class = &wpan_phy_class; 171 172 phy->current_channel = -1; /* not initialised */ 173 phy->current_page = 0; /* for compatibility */ 174 175 return phy; 176 177out: 178 return NULL; 179} 180EXPORT_SYMBOL(wpan_phy_alloc); 181 182int wpan_phy_register(struct wpan_phy *phy) 183{ 184 return device_add(&phy->dev); 185} 186EXPORT_SYMBOL(wpan_phy_register); 187 188void wpan_phy_unregister(struct wpan_phy *phy) 189{ 190 device_del(&phy->dev); 191} 192EXPORT_SYMBOL(wpan_phy_unregister); 193 194void wpan_phy_free(struct wpan_phy *phy) 195{ 196 put_device(&phy->dev); 197} 198EXPORT_SYMBOL(wpan_phy_free); 199 200static int __init wpan_phy_class_init(void) 201{ 202 int rc; 203 204 rc = class_register(&wpan_phy_class); 205 if (rc) 206 goto err; 207 208 rc = ieee802154_nl_init(); 209 if (rc) 210 goto err_nl; 211 212 return 0; 213err_nl: 214 class_unregister(&wpan_phy_class); 215err: 216 return rc; 217} 218subsys_initcall(wpan_phy_class_init); 219 220static void __exit wpan_phy_class_exit(void) 221{ 222 ieee802154_nl_exit(); 223 class_unregister(&wpan_phy_class); 224} 225module_exit(wpan_phy_class_exit); 226 227MODULE_LICENSE("GPL v2"); 228MODULE_DESCRIPTION("IEEE 802.15.4 configuration interface"); 229MODULE_AUTHOR("Dmitry Eremin-Solenikov"); 230 231